Fishes swim north when the ocean becomes warmer

Jeanna Bryner

When the home waters become too hot, some fishes swim north for the first time in hundreds of years in search of cooler waters.

According to some archaeological studies, tax declarations, church and monastic books, the underwater inhabitants of the distant past compared to today's fishes belong to a hot world. up. The results are detailed on 14 pages on the special issue of Fisheries Research. The results have shed light on how global warming affects fishing grounds.

Climate models from each region as well as globally have predicted that air and sea temperatures will increase by about 5.4 ^o F (3 ^o C) in the next 70 to 100 years.

The vertebrae of the plantations are captured by the peninsula's population of the Stone Age.Two vertebrae of modern cultured fish are compared.(Artwork: G. Brovad)

Scientists studied the bones of prehistoric ancient fish, the period of the earth warming around 7,000 to 3,900 BC in the Scandinavian Peninsula. They have found many species of fish that live in warm waters such as cultured fish or black bream, which are thought to reside mainly in the southern waters. While they disappear in archaeological notes when temperatures become cool, many species return to the waters around Denmark as temperatures rise in the past decade.

Another study of marine life during the coldest periods of the Earth, the Little Ice Age, from 1674 to 1696. The results show that herring lives in cold waters, flounder or eel as a source of seafood. main in the Baltic Sea at the time. However, the fish species live in the sea as warm as the perch, the Sandre only accounts for less than 1% of the production. According to the researchers, these warm sea fishes are now relatively common in the Baltic Sea. This shows that they swim north when the waters here become more pleasant.

Too arbitrary fishing also greatly affects the number of fish species.

The recent rise in sea temperature has affected the survival of small cod fish in the North Sea, but this cold water fish in the prehistoric warmth has appeared very much on the Peninsula peninsula- vi. According to the researchers, smaller fishing pressure in the past helped preserve the amount of cod. That means that the number of cod species that can live in the frozen North Sea could be maintained through the period of climate change predicted to occur in the 21st century.